diff options
Diffstat (limited to 'arch/x86_64/Kconfig')
| -rw-r--r-- | arch/x86_64/Kconfig | 30 |
1 files changed, 16 insertions, 14 deletions
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig index fc75275d8c72..e8c52a1eec06 100644 --- a/arch/x86_64/Kconfig +++ b/arch/x86_64/Kconfig @@ -386,24 +386,26 @@ config HPET_EMULATE_RTC bool "Provide RTC interrupt" depends on HPET_TIMER && RTC=y -config GART_IOMMU - bool "K8 GART IOMMU support" +# Mark as embedded because too many people got it wrong. +# The code disables itself when not needed. +config IOMMU + bool "IOMMU support" if EMBEDDED default y select SWIOTLB select AGP depends on PCI help - Support for hardware IOMMU in AMD's Opteron/Athlon64 Processors - and for the bounce buffering software IOMMU. - Needed to run systems with more than 3GB of memory properly with - 32-bit PCI devices that do not support DAC (Double Address Cycle). - The IOMMU can be turned off at runtime with the iommu=off parameter. - Normally the kernel will take the right choice by itself. - This option includes a driver for the AMD Opteron/Athlon64 IOMMU - northbridge and a software emulation used on other systems without - hardware IOMMU. If unsure, say Y. - -# need this always selected by GART_IOMMU for the VIA workaround + Support for full DMA access of devices with 32bit memory access only + on systems with more than 3GB. This is usually needed for USB, + sound, many IDE/SATA chipsets and some other devices. + Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART + based IOMMU and a software bounce buffer based IOMMU used on Intel + systems and as fallback. + The code is only active when needed (enough memory and limited + device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified + too. + +# need this always selected by IOMMU for the VIA workaround config SWIOTLB bool @@ -503,7 +505,7 @@ config REORDER config K8_NB def_bool y - depends on AGP_AMD64 || GART_IOMMU || (PCI && NUMA) + depends on AGP_AMD64 || IOMMU || (PCI && NUMA) endmenu |